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๐ Topic Summary
3D shapes, also known as solids, are shapes that have three dimensions: length, width, and height. Unlike 2D shapes which are flat, 3D shapes take up space. Understanding the components of these shapes โ faces, edges, and vertices โ is fundamental in geometry. A face is a flat surface, an edge is a line segment where two faces meet, and a vertex (plural: vertices) is a point where edges meet.
๐ Part A: Vocabulary
Match the terms with their definitions:
| Term | Definition |
|---|---|
| 1. Face | A. A point where edges meet |
| 2. Edge | B. A flat surface of a 3D shape |
| 3. Vertex | C. A line segment where two faces meet |
โ๏ธ Part B: Fill in the Blanks
A cube has six ___________, twelve ___________, and eight ___________. A sphere has no ___________, no ___________, and no ___________. A cone has one ___________, one ___________, and one ___________. Identifying these components helps us understand the properties of different 3D shapes.
๐ค Part C: Critical Thinking
Imagine you are building a house out of 3D shapes. Which 3D shapes would be best for the walls and roof, and why?
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